My Blender sculpt brush subtract mode color is set to blue but shows white instead. Why is that?
This is a really old question but the answer is that there are actually three colors for the brushes. One for add, one for subtract, and white for smooth. If you choose the 'Smooth' brush you'll see it is white. Holding 'Shift' with another brush is basically changing whatever you're using to a 'Smooth' brush.